Ionic cordova => Issue with firebase pushup notification

I am trying to implement pushup notification into my app. I found its supporting till android@8.0.0

Please let me know - is it true?can we add "platform add android@8 + "? if yes=>how?

below are detail
cordova create firebasepro firebasepro
cordova platform add android@8.0.0
cordova plugin add cordova-plugin-firebase-lib@4.1.0 --save
cordova plugin add cordova-plugin-androidx
cordova plugin add cordova-plugin-androidx-adapter
cordova build android

Ionic CLI : 6.13.1
Ionic Framework : @ionic/angular 5.6.8
@angular/cli : 12.0.2

Cordova CLI : 10.0.0
Cordova Platforms : android 8.0.0

NodeJS : v14.16.1
npm : 7.11.2